/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
 * Ackermann, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details. You should have received a copy of the GNU Affero General Public License along with this program; if not,
 * see http://www.gnu.org/licenses or write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL: http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions of this program must display Appropriate
 * Legal Notices, as required under Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License, a covered work must retain the producer
 * line in every PDF that is created or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing a commercial license. Buying such a license is
 * mandatory as soon as you develop commercial activities involving the iText software without disclosing the source
 * code of your own applications. These activities include: offering paid services to customers as an ASP, serving PDFs
 * on the fly in a web application, shipping iText with a closed source product.
 *
 * For more information, please contact iText Software Corp. at this address: sales@itextpdf.com
 */
package com.itextpdf.tool.xml.css;

import com.itextpdf.tool.xml.Tag;

import java.util.*;
import java.util.Map.Entry;

/**
 * @author itextpdf.com
 *
 */
public class CssFilesImpl implements CssFiles {

	private final List<CssFile> files;
	private final CssUtils utils;

	/**
     * Constructs a new CssFilesImpl.
     */
	public CssFilesImpl() {
		this.files = new ArrayList<CssFile>();
		this.utils = CssUtils.getInstance();
	}

	/**
	 * Construct a new CssFilesImpl with the given css file.
	 * @param css the css file
	 */
	public CssFilesImpl(final CssFile css) {
		this();
		this.add(css);
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see com.itextpdf.tool.xml.css.CssFiles#hasFiles()
	 */
	public boolean hasFiles() {
		return !this.files.isEmpty();
	}

	/**
	 * Processes a tag and retrieves CSS. Selectors created:
	 * <ul>
	 * <li>element</li>
	 * <li>element&gt;element (and a spaced version element &gt; element)</li>
	 * <li>#id</li>
	 * <li>.class</li>
	 * <li>element+element ( and a spaced version element + element)</li>
	 * </ul>
	 */
	public Map<String, String> getCSS(final Tag t) {
		Map<String, String> aggregatedProps = new LinkedHashMap<String, String>();
		populateCss(t, aggregatedProps);
		return aggregatedProps;
	}

    public void populateCss(final Tag t, final Map<String, String> aggregatedProps) {
        List<CssRule> rules = new ArrayList<CssRule>();
        for (CssFile cssFile: this.files) {
            rules.addAll(cssFile.get(t));
        }
        Collections.sort(rules);
        for (CssRule rule: rules)
            populateOneCss(aggregatedProps, rule.getNormalDeclarations());
        for (CssRule rule: rules)
            populateOneCss(aggregatedProps, rule.getImportantDeclarations());

    }

    public void populateOneCss(final Map<String, String> aggregatedProps, final Map<String, String> cssDeclaration) {
        Map<String, String> css = new LinkedHashMap<String, String>();
        for (Entry<String, String> e : cssDeclaration.entrySet()) {
            String key = utils.stripDoubleSpacesTrimAndToLowerCase(e.getKey());
            String value = utils.stripDoubleSpacesAndTrim(e.getValue());
            if (CSS.Property.BORDER.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBorder(value));
            }  else if (CSS.Property.BORDER_TOP.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBorder(value, CSS.Property.BORDER_TOP));
            } else if (CSS.Property.BORDER_BOTTOM.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBorder(value, CSS.Property.BORDER_BOTTOM));
            } else if (CSS.Property.BORDER_LEFT.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBorder(value, CSS.Property.BORDER_LEFT));
            } else if (CSS.Property.BORDER_RIGHT.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBorder(value, CSS.Property.BORDER_RIGHT));
            } else if (CSS.Property.MARGIN.equalsIgnoreCase(key)) {
                Map<String, String> margins = utils.parseBoxValues(value, "margin-", "");
                for (String marginKey : margins.keySet()) {
                    if (!css.containsKey(marginKey)) {
                        css.put(marginKey, margins.get(marginKey));
                    }
                }
            } else if (CSS.Property.BORDER_WIDTH.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBoxValues(value, "border-", "-width"));
            } else if (CSS.Property.BORDER_STYLE.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBoxValues(value, "border-", "-style"));
            } else if (CSS.Property.BORDER_COLOR.equalsIgnoreCase(key)) {
                css.putAll(utils.parseBoxValues(value, "border-", "-color"));
            } else if (CSS.Property.PADDING.equalsIgnoreCase(key)) {
                Map<String, String> paddings = utils.parseBoxValues(value, "padding-", "");
                for (String paddingKey : paddings.keySet()) {
                    if (!css.containsKey(paddingKey)) {
                        css.put(paddingKey, paddings.get(paddingKey));
                    }
                }
                //css.putAll(utils.parseBoxValues(value, "padding-", ""));
            } else if (CSS.Property.FONT.equalsIgnoreCase(key)) {
                css.putAll(utils.processFont(value));
            } else if (CSS.Property.LIST_STYLE.equalsIgnoreCase(key)) {
                css.putAll(utils.processListStyle(value));
            } else if (key.toLowerCase().contains(CSS.Property.BACKGROUND)) {
                Map<String, String> backgroundStyles = utils.processBackground(value);
                for (String backgroundKey : backgroundStyles.keySet()) {
                    if (!css.containsKey(backgroundKey)) {
                        css.put(backgroundKey, backgroundStyles.get(backgroundKey));
                    }
                }
            } else {
                css.put(key, value);
            }
        }
        aggregatedProps.putAll(css);
    }

	/* (non-Javadoc)
	 * @see com.itextpdf.tool.xml.css.CssFiles#addFile(com.itextpdf.tool.xml.css.CssFile)
	 */
	public void add(final CssFile css) {
        if (css != null) {
		    this.files.add(css);
        }
	}

	/* (non-Javadoc)
	 * @see com.itextpdf.tool.xml.css.CssFiles#clear()
	 */
	public void clear() {
		Iterator<CssFile> iterator = files.iterator();
		while(iterator.hasNext()) {
			CssFile next = iterator.next();
			if (!next.isPersistent()) {
				iterator.remove();
			}
		}
	}

}
